三剑客之sed流编辑器

三剑客之sed流编辑器

sed [OPTION]... {script-only-if-no-other-script} [input-file]...

相关参数

• -n suppress automatic printing of pattern space(即取消sed默认输出)

• -e add the script to the commands to be executed(可支持连续使用sed)

• -i edit files in place (makes backup if SUFFIX supplied)(支持源文件修改)

• -r use extended regular expressions in the script.(支持扩展正则表达式)

内置参数

• a Append text, which has each embedded newline preceded by a backslash

• d Delete pattern space. Start next cycle.

• i Insert text, which has each embedded newline preceded by a backslash.

• p Print up to the first embedded newline of the current pattern space.

[root@gsh ~/test]# ifconfig eth0 >>test.txt
[root@gsh ~/test]# cat test.txt 
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 10.0.0.100  netmask 255.255.255.0  broadcast 10.0.0.255
        inet6 fe80::3dbf:a79d:a1e4:f44c  prefixlen 64  scopeid 0x20<link>
        ether 00:0c:29:60:21:c3  txqueuelen 1000  (Ethernet)
        RX packets 1600  bytes 123578 (120.6 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 1953  bytes 2129196 (2.0 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

-n

[root@gsh ~/test]# sed -n '2,3p' test.txt 
        inet 10.0.0.100  netmask 255.255.255.0  broadcast 10.0.0.255
        inet6 fe80::3dbf:a79d:a1e4:f44c  prefixlen 64  scopeid 0x20<link>
[root@gsh ~/test]# sed -n 2p test.txt 
        inet 10.0.0.100  netmask 255.255.255.0  broadcast 10.0.0.255
[root@gsh ~/test]# sed -n '/10.0.0.100/p' test.txt 
        inet 10.0.0.100  netmask 255.255.255.0  broadcast 10.0.0.255

-e

[root@gsh ~/test]# sed -n '/10.0.0.100/p' test.txt |sed -e 's#^.*inet ##g' -e 's#  netmask.*$##g'
10.0.0.100

-i

[root@gsh ~/test]# sed -i '/^$/d' test.txt 
[root@gsh ~/test]# cat test.txt 
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 10.0.0.100  netmask 255.255.255.0  broadcast 10.0.0.255
        inet6 fe80::3dbf:a79d:a1e4:f44c  prefixlen 64  scopeid 0x20<link>
        ether 00:0c:29:60:21:c3  txqueuelen 1000  (Ethernet)
        RX packets 1600  bytes 123578 (120.6 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 1953  bytes 2129196 (2.0 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

-r

[root@gsh ~/test]# sed -n 2p test.txt |sed -rn 's#^.*inet (.*)  netmask.*$#\1#gp'
10.0.0.100
[root@gsh ~/test]# 
[root@gsh ~/test]# stat test.txt |sed -rn 's#^.*\(0(.*)/-rw.*$#\1#gp'
644
[root@gsh ~/test]# 

a

[root@gsh ~/test]# sed '2a test' test.txt 
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 10.0.0.100  netmask 255.255.255.0  broadcast 10.0.0.255
test
        inet6 fe80::3dbf:a79d:a1e4:f44c  prefixlen 64  scopeid 0x20<link>
        ether 00:0c:29:60:21:c3  txqueuelen 1000  (Ethernet)
        RX packets 1600  bytes 123578 (120.6 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 1953  bytes 2129196 (2.0 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
[root@gsh ~/test]# 

d

[root@gsh ~/test]# sed '/10.0.0.100/d' test.txt 
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet6 fe80::3dbf:a79d:a1e4:f44c  prefixlen 64  scopeid 0x20<link>
        ether 00:0c:29:60:21:c3  txqueuelen 1000  (Ethernet)
        RX packets 1600  bytes 123578 (120.6 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 1953  bytes 2129196 (2.0 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
[root@gsh ~/test]# 

i

[root@gsh ~/test]# sed '2i test' test.txt 
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
test
        inet 10.0.0.100  netmask 255.255.255.0  broadcast 10.0.0.255
        inet6 fe80::3dbf:a79d:a1e4:f44c  prefixlen 64  scopeid 0x20<link>
        ether 00:0c:29:60:21:c3  txqueuelen 1000  (Ethernet)
        RX packets 1600  bytes 123578 (120.6 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 1953  bytes 2129196 (2.0 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
[root@gsh ~/test]# 

p

[root@gsh ~/test]# sed -n 2p test.txt 
        inet 10.0.0.100  netmask 255.255.255.0  broadcast 10.0.0.255
[root@gsh ~/test]#